Folding double wall box



Jan. 19, 1943.

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FOLDING DOUBLE w'ALL 130x4 File'd Sept. 12, 1939 3 Sheets-Sheet 3 y BY ATTORNEYS.

Patented Jan. 19,

UNITED STATES PATENT OFFICE FoLDrNG DOUBLE WALL nox David Lcvkoil, Brooklyn, N. Y.

' Application September 12, 1939, Serial No. 294346 s claims. (c1. 22944) 'I'his invention relates to improvements in pap'er boxes and more particularly to a double wall folding box. y

One of the important features of the invention resides in a folding box having an air space in the walls thereof for ventilation or freezing purposes, whereby normal or cold air may be circulated therethrough for the preservation of foodstuffs packed in the box.

Another feature of the invention is to provide a folding paper box in which communicating air spaces are provided in the walls thereof, the air spaces being defined by a double wall structure which in addition to imparting a Ventilating feature to the box, also provides a cushioning feature to protect fragile articles packed in the box from accidentally breaking during shipment or handling.

Another feature of the invention is the provision of a paper box especially adaptable for the packaging of frozen foods, and by the use of which, such frozen foods may be kept in ordinary refrigeration by subjecting it to a continuous amount of frozen air witha minimum amount of insulation.

A still further feature of the invention is rto provide a paper box having spaced double side, end and bottom walls, which define air spaces, and which further act to strengthen the box to withstand external forces to which the box may be subjected during ordinary handling and shipment.

A still further feature of the invention is to provide a folding paper box having the novel features herein set forth which is cut, scoredl and folded from a single blank of cardboard, and which is partially set up by gluing or stitching to lie fiat when collapsed for storing purposes, and which may be completely set up by hand with dispatch when use of a box is desired.

Other novel features of the invention will be apparent as the following specification is read in conjunction with the accompanying drawings, in

which:

Figure l is a perspective view of a folding paper box constructed in accordance with my invention, the same being illustrated in-set up position With the hinged cover open.

Figure 2 is a vertical longitudinal sectional view on the line 2-2 of Figure 1, with the cover in closed position.

Figure 3 is a vertical transverse sectional view on the line 3-3 of Figure 1, with the cover in closed position.

Figure 6 is a vertical'sectional view of the` blank in partially folded position to illustrate the position of the parts when collapsed for storing purposes.

Figure 'I is a perspective view of a modified form of folding box, one end wall being illustrated in unfolded position.

Figure 8 is an enlarged detail horizontal sectional view on the line 8-8 of Figure 7.

FigureA 9 is a perspective view of a further modified form of folding box with one end wall in unfolded position,

Figure 10 is an enlarged detail vertical sectional view on the line IIJ-I0 of Figure 9.

Figure 11 is a perspective view of a double wall box provided with a folding stitched end wall.

Figure 12 is a sectional perspective view of a modified form of end wall.

Referring to the drawings by reference characters, and at present to the form of the invention illustrated in Figures 1 to 6 inclusive, the letter A designates a blank of cardboard or other fibre material which is elongated in a vertical direction, and which is scored transversely on the horizontal parallel fold lines I0, II, I2, I3, I4, I5, I6, I1, I8, and I9. The area from the top of the blank A to the fold line I I constitutes a cover B, the area of the blank from the fold line II to the fold line I4 constituting an outer box body section C, and the area from the fold line I4 to the bottom edge of the blank constitutes an inner box body section D. While I have illustrated the blank A as including a cover section B, it is to be understood that the boxv body may be constructed of the sections C and D without the cover section B, and the box body may be closed by means of aslip cover rather than by the hinge type cover herein illustrated.

The outer box body section C is scored on the vertical lines 20--20 which extend from lthe ,fold une to the fom une I4. The area aeof the score lines 20420, are corner flaps 24.4

Integral with-the bottom wall 2| and extending from the ends thereof, are outer end walls -25 which are separated from top walls 28,-28 by the vertical fold lines 21-21. The top Walls 26-28 are separated from yinwardly folding end naps 28-28 by the vertical fold lines 29-29. The flaps 28-28 are cut inwardly from their ends to provide flaps of a width approximating the distance between the side walls of the inner box section B for frictional interfitting engagement therewith.

The inner box section D is scored on the vertical lines 30-30, the same being disposed inwardly of the plane of the corresponding fold lines 20-20 of the outer box section C for a. distance approximating the distance between the lspaced end structures of the inner and outer box sections. The score lines 30-30 extend Afrom the horizontal fold line I5 to the horizontal fold line I8 and that portion of the fold lines 30-30 disposed between the fold lines I 8V and I1 coact with the latter to definev an inner bottom wall 3|. The fold lines I5 and I8 and the inner end portions of the fold lines 30-30 define an inner side wall 32. The area between the 'fold lines I1 and I8 and the lower ends of the fold lines 30-38 define an inner side wall 33. Disposed outwardly from opposite ends of the bottom wall 3| are inner end walls 34-34 which are separated from inwardly and downwardlyfoldable end iiaps 35-35 by the vertical score lines 36-36. Integral with the end walls 34-34 and the side walls 32 and 33 are inwardly foldable corner web flaps 31, the said flaps being foldable on the diagonal fold lines 38 which extend outwardly at a 45 angle from the four corners of the bottom wall 3|. The fold lines I6 and I1 are broken, and the broken portions are connected by U-shaped slits 38, whereby upon folding of the inner box section D to a set up position will cause the dependingleg portions 39 formed by the slits 38 to extend downwardly and maintain the inner bottom wall 3| in spaced relation to the outer bottom wall 2|. The score lines 30-30 are also broken, and the broken portion connected 'by U-shaped slits 40, which slits form depending feet 4I integral with the end walls 34-34 when the inner box section D is folded, and which feet 4I coact with the feet 39 to maintain the inner and outer bottom walls in spaced relation.

The material of the blank between the fold lines |4 and I5 constitutes a narrow top wall 42 between the outer side wall 23 and the inner side wall 32. The area between the'fold lines I8 and I9 constitutes a narrow top wall 43 to close the space between the outer side wall 22 and the inner side Wall 33. The material of the blank between the fold lines |9 and the lower edge of the blank constitutes an attaching glue flap 44, which flap is gluedas at to the inner side of the side wall. 22 adjacent the top edge thereof and which gluing constitutes the initial step toward the complete folding and setting up of the double wall box. Initially, the blank may be folded either on the fold line I4 constitutes a cover flap 41, the ends ofthe flap- I being cut away to facilitate the infolding of theA same within the box when the box is in set up position.

After the blank A has been initially folded to effect gluing of the flap 44 of the inner box secblank so as to eifecteasy folding. As the side walls 22 and 23 are folded into position, the corresponding side walls 33'and` 32 respectively of the inner box section will fold to a corresponding position. The parallel side walls 23 and 32 will be bridged by the top wall 42 whereas the parallel side walls 22 and 33 will be bridged by the top wall 43.v As the inner side walls 32 and 33 are moved to their vertical position, the feet 39 engage the outer bottom wall 2| to maintain the inner bottom wall 3| in spaced relation thereto. After the inner and outer box sections have been folded to the position stated, the inner end wall structures of the box section D are folded into position. As the end walls 34-34 are swung upwardly, the inwardly foldable corner webs 31 fold inwardly into lapped triangular shaped sections and close the four corners of the inner box section. After the end walls 34-34 are 'folded to vertical position, the flaps 35-35 are folded inwardly so as to overlie the inwardly folded corner webs 31 as best illustrated in Figures 2 and 4 of the drawings. As the inner end walls 34 are folded to their vertical position, the feet 4I which are integral therewith depend downwardly and cooperate with the feet 39 to maintain the inner bottom wall 3| in spaced relation to the outer bottom wall 2l'. The end Wall constructionsl of the inner box section Dv now being folded, the end wall constructions of the outer box section C may now be folded. The corner flaps 24 are swung inwardly and the end walls 25-25 upwardly, so as to overlie the aps 24, after which the end w-all structures are folded on the lines 21 and 29 to enable the top Walls 28--28 to bridge the space'between the inner and outer end Wall structures, whereupon the flaps 28 are-folded inwardly and the ends frictionallyengage the or I5, and the glue flap 44 folded and adhesively y the score line I0 and the top edge of the blank inner side walls 32 and 33. The box body is now in a set upA position as illustrated in Figures 1 to 4 inclusive, whereupon a hollow wall structure is provided. The ends of the hollow side walls are closed by the outer end wall structures, and the space between the hollow end walls and the hollow side walls communicate with the interior of the'box body through the slots 41' formed by the cutting out of the legs 39 from the inner bottom wall 3|. If desired, the air spaces between the inner and outer spaced walls of the box body may communicate with the atmosphere through openings 48 which may be cut in the outer bottom wall 2|. The placing of the openings 48 in the bottom wall is optional depending upon the purpose for which the box is to be used. As previously stated, it is also optional whether the hinged cover section B is provided, but if soI the same may be swung to a position over the open box body and the flap 41 inserted against the inner side wall 32.

with the interior of the box body and the com' munication of the air spaces with the exterior o r frigid atmosphere.

Boxes of this construction may be employed for the maintaining of food stuifs in a cold or frozen condition by merely opening one of the end wall structures and inserting dry ice into the open ends of the hollow side walls, and after which, folding the end wall structurev to closed position. With the dry ice packed in the hollow side wallsthe contents of the box may be'kept frozen.

In Figures 7 and 8 of the'drawings, I have illustrated a modiiied construction of my invention wherein the box body includes an inner bottom wall 50, integral inner side walls 5| and 52, outer side walls 53 and 54, the latter being integral with the longitudinal sides of an outer bottom wall 55. The ends ofthe inner bottom wall 50 terminate short of the ends of the outer bottom wall 55 for a purpose to be presently explained. Connecting the inner and outer side walls 52 and 53 is a top wall 56 and integral with the inner side walls 5| is a top connecting wall 51, the same being integral with a glue flap 58, the latter being adhesively secured to a hinged cover 59, which is integral with the outer side wall 54. Instead of forming thecommumcating openings between the interiorof the boxand the' spaces between the hollow side walls by forming the openings 41 in the bottom wall, I provide openings 60 in the side walls and permit the inner wall 50 to lie at against the outer bottom wall 55. 'Ihe material from the openings 60 constitutes horizontal outwardly extending tabs 6|' which engage and brace the outer side walls 53 and 54.

Each end wall structure in Figures '1 and 8 includes an outer end wall 6| which is integral with an end of the outer bottom wall 55 and which is foldable to a vertical position on the fold line 62. Each outer end Wall 6| is connected to the ends of the outer side walls 53 and 54 by inwardly folding corner Webs 63, which corner websoverlie the open ends of the hollow side walls as illustrated in Fig. 8 when the box body is in set up position. Integral with the inner end wall 6 is a top wall 64 which is defined by the fold lines 65 and 66. Foldable relative to the top wall 64 on the fold line 66, is an inner end wall 61, the ends of which are provided with locking ,tongues 68. A bottom ap 69 is connected to the flap 61 along the fold line 10. Each end wall structure may be folded and locked by rst folding the corner webs 63 on the diagonal fold lines 1| and simultaneously folding the outer end wall 6| upwardly, after which the top wall 64 is formed by folding on the lines 65 and 66, whereupon the inner end Wall 61 may be folded inwardly "to vertical position and the tongue 68 inserted into the slits 12 provided at the ends of the inner side walls 5| and 52. The iiap 69 is foldable to a horizontal position into abutting engagement with the ends of the shorter inner bottom wall 50.

In Figures 9 and 10, a further modified construction is shown, and lwherein the bottom and side Walls are substantially the same as that illustrated in Figures 1v to 6 inclusive, but the end wall construction is slightly different and eliminates the use of inwardlyY folded corner flaps. In view of the similarity `oi? the form of the invention illustrated in Figuresy 9 and 10 with that of Figures l to 6 inclusive, it is believed that a description of the end wall construction alone will suiilce. Formed integral with each end of the outer bottom wall 2|' is an outer end wall 25' of a width equal to the width of the box body, and which is foldable against an open end of the hollow side walls. Formed integral with the outer end wall 25' is a top wall 26' dened by the fold lines 21' and 29'. Foldable relative to the top wall 26 along the fold line 29' is an inner end wall 28', the ends of which are provided with hook tongues 13 'which when the end wall structure is in folded position, are received in vertical slots 14 provided adjacent the ends of the inner side walls 32' and 33. The bottom edge of the inner end wall 28' is provided with a. tongue extension 15 which is received in a transversely disposed slot 16 in the inner bottom wall 3|'. By this end wall construction, it will be seen that the outer end wall Will close the open ends of the hollow side walls and that the inner end walls 28 are held in spaced relation to the outer end walls 25 by means of the interlocking tongues 13 with the slots 14 and the tongues 15 with the slots 16. This interlocking of the inner end wall with the inner walls of the box body prevents any accidental unfolding of the end Walls and accidental collapsing of the box body.

In Figure ll of the drawings. a still further modied form of the invention is illustrated wherein the box body is provided with abutting outer and inner bottom walls in the same manner as that shown in Figures '1 and 8, and with hollow side walls -80, the inner Walls of the hollow side walls being provided with opposed openings 8| which may act as seats for fragile articles supported by the walls of the opposed openings. Integral with one end of the outer walls of the hollow side walls are inwardly foldable end flaps 82, the same having interlocking notches 83 whereby the flaps may be held in closed position against one end of the hollow side walls. The interlocking flaps 82'-82 constitute an inner end wall whereas the outer end wall 84 integral with Ithe outer bottom wall is foldable against the flaps and has a swinging cover 85 integral therewith. The free end of the cover 85 -is provided with a folding flap 86 adapted to fit into the opposite end of the box body when in closed position. of the box body comprises a folding end wall structure 81, the parts being secured together by a metal stitch 88, and which construction of end Wall is similar to that shown in my pending application, Serial No. 223,388, filed August 6, 1938. When the end wall 81 is folded to upright position, it closes the front end of the box body whereas the interlocking flaps 82-82, outer end Wall 84, close the rear end of the body and the cover 85 when swung to closed position closes the open top of the body with the ap 86 fitting against the end Wall structure 81.

In Figure 12 of the drawings, there'is illustrated a still further modified form which includes an inner bottom wall |00, and an outer bottom wall |0|, and formed integral with each end of the inner bottom wall |00 isan inner end wall |02 and anouter spaced end wall |03 connected by a top wall |04. The outer bottom wall This opposite end is of a length slightly greater than the inner bottom wall |00 and foldable into a position between these bottom walls is a locking flap |05. The ends of the inner end wall |02 are provided with locking tongues |06, each of which is received in a slot |01 formed in the inner side Wall |08, the outer side wall |00 extending to and being engageable with the outer end wall |03. This modification distinguishes from the end wall construction shown in the preceding'forms, in that it is folded outwardly from the bottom wall structure rather than inwardly.

y While I have shown and described several forms of my invention, I wish it to be understood that other modifications may be resorted to as come within the scope of the appended claims.

Having thusl ldescribed the invention, what I claim as new and desire to secure by Letters Patent of the United States, is: y

l. A folding double wall box blank comprising a. single blank of cardboard cut and scored to provide a foldable outer boxsection including a rectangular outer bottom wall, two opposed outer side walls connected to the bottom wall along hinge scores, two opposed outer end walls connected to the outer bottom wall along hinge scores; an inner box section including an inner bottom wall, two opposed inner side walls ccnnected to the inner bottom wall along hinge scores, hinge score connections between one of the inner side walls and an adjacent outer side wall, two opposed inner end Walls connected to the inner bottom wall along hinge scores, said inner box section being foldable within the outer box section along the hinge score connecting the adjacent inner and outer side walls, a glue flap connected to the otherof the inner side walls along a hinge score and adapted to be secured to the inner side of the other outer side wall, and releasable interlocking means for securing the side and end walls of the inner and outer box sections in erected position when the blank is folded thereto. l

2. A folding double wall box blank as set forth in claim 1, including a cover connected to the other outer side wall along a hinge score.

3. A folding double wall box blank as.setforth in claim 1, including means foldable from the inner and outer box sections of the blank for spacing the walls of the inner box section from the respective corresponding walls ofthe outer box section. h

4. A folding double-wall rectangular box -blank including an outer box section having a rectangular outer bottom wall panel, rectangular cuter side Wall panels connected to opposite sides of the outer bottom wall panel along hinge scores, outer rectangular end wall panels connected to the respective ends of the outer bottom Wall panel along hinge scores, end top spacer wall panels respectively connected to outer end wall panels along hinge scores and being of a length equal to the length of the outer end wall panels, inwardly foldable flaps respectively connected to the top spacer Wall panels along hinge scores, said flaps being of a length shorter than the top spacer wall panels and terminating short of the ends thereof; an inner box section having arectangular inner bottom wall panel or a length and width 'slightly iess than the outer sides of the bottom wall panel along hinge scores, inner rectangular end wall panels respectively connected to the'opposed'ends of the inner bottom wall panel along hinge scores, spacer feet cut from the inner bottom wall panel and integral with the inner side wall panels for vertical folding with the inner side wall.` panels,

side top spacer wall panels connected to therespective inner side wall panels along hinge scores.

said side top spacer wall panels being of a width. substantially equal to that of the en d top wall spacer panels, one of the side top wall spacer panels being integrally connected to one of the outer side wall panels along a hinge score, and a. glue flap connected to the other side top wall panel along a hinge score for attachment to one of the outer side wall panels when the blank is folded to set up position with the @all panels of the inner box section folded within and disposed in spaced relation to corresponding walls of the outer box sectio 5. A folding double-wall rectangular box blank as set forth in claim 4, including corner flaps connected to the respective ends of the outer side wall panels for infolding against the inner side of the outer end wall panels, foldable corner webs integral with the adjacent inner side and end wall panels and connected thereto along hinge scores for folding to a position against the respective adjacent inner end wall panels,

. and intermediate panel flaps connected to the respective inner end wall panels for folding against the folded corner webs when the blank is folded to box set up position.

6. In a folding double-wall box, a single substantially rectangular blank of cardboard scored transversely on a hinge score and folded thereon to provide an outer box forming section and an inner box forming section, said outer box forming section having a rectangular outer bottom wall, opposed rectangular side walls connected to the sides of the bottom wall along hinge scores, inwardly'foldable outer end walls connected to the opposed ends of the outer bottom wall along hinge scores; said inner box forming section having an inner rectangular bottom wall of a length and width slightly less than that ofthe outer bottom wall, inner side walls of a height slightly less than the height of the outer side walls, one of the inner side walls being integrally connected to an adjacent outer side Wallalong that hinge score connecting the inner and outer box forming sections, inner foldable end walls connected to the respective ends of the inner bottom wall along hinge scores, a glue flap integral with the other inner side wall and adhesively secured to the inner side of the other or free outer side Wall, whereby said inner and outer box 4forming sections may be flatly folded against each other when the box is collapsed and unfolded to a set up position With the inner box forming section disposed within the outer box forming section.

DAVID LEVKOFF. 

